Biologia plantarum 51:501-506, 2007 | DOI: 10.1007/s10535-007-0105-x

Regrowth dynamics of Calamagrostis epigejos after defoliation as affected by nitrogen availability

V. Gloser1,*, M. Košvancová1, J. Gloser1
1 Department of Plant Physiology and Anatomy, Faculty of Science, Masaryk University, Brno, Czech Republic

Young plants of a rhizomatous grass Calamagrostis epigejos (L.) Roth were grown from seed in nutrient solutions containing nitrogen in concentrations 0.1, 1.0, and 10 mM. After six weeks of cultivation the plants were defoliated and changes in growth parameters and in content of storage compounds were measured in the course of regrowth under highly reduced nitrogen availability. Plants grown at higher nitrogen supply before defoliation had higher amount of all types of nitrogen storage compounds (nitrates, free amino acids, soluble proteins), which was beneficial for their regrowth rate, in spite of lower content of storage saccharides. Amino acids and soluble proteins from roots and stubble bases were the most important sources of storage compounds for regrowth of the shoot. Faster growth of plants with higher N content was mediated by greater leaf area expansion and greater number of leaves. In plants with lower contents of N compounds number of green leaves decreased after defoliation significantly and senescing leaves presumably served as N source for other growing organs. Results suggest that internal N reserves can support regrowth of plants after defoliation even under fluctuating external N availability. Faster regrowth of C. epigejos with more reserves was mediated mainly by changes in plant morphogenesis.

Keywords: amino acids; nitrates; nitrogen storage compounds; non-structural saccharides; soluble proteins
Subjects: amino acids; Calamagrostis epigejos; leaf anatomy; regrowth after defoliation; saccharides

Received: December 21, 2005; Accepted: January 20, 2007; Published: September 1, 2007Show citation

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Gloser, V., Košvancová, M., & Gloser, J. (2007). Regrowth dynamics of Calamagrostis epigejos after defoliation as affected by nitrogen availability. Biologia plantarum, 51(3), 501-506. doi: 10.1007/s10535-007-0105-x.
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